iPhoto / Tiger problems...



I have just installed Tiger, but do not have iLife. I have a Powerbook G4 and used iPhoto v4 with it. How can I install iPhoto v4 on Tiger? I have tried to use the Install/Restore discs as advised that came with the Powerbook and they do not let me just install the iPhoto programme, they seem to want me to do a fresh install of the old OS...
Also, now that I have tried this (I did a restart with the install disk in) I now get a little blue folder with a question mark in it when I turn on the computer (this disappears after a few seconds and then Tiger starts as normal).

Please help!!